PA's

Ok, I recently when to a small guitar bass workshop today and the guitar teacher there was running powered PA speakers, 2 of, for his guitar rig. He runs all his effect rack into it as well and its has an awsome sound and he says that he likes it alot more than his trace elliot rig he previously owned. I was curious whether you could run that same type of thing with a bass and get good results. The Speakers were about 400w each. Anyone know the answer to my question??